New gauge cluster reads off..

[GEKicker08]

I was on the road home last night and got pulled over b/c the police officer said I was doing 77 in a 65, I had the car set on 70 and was using cruise control the entire time. Could the new gauge cluster be reading off? It was a completely flat road with no hills (mississippi). Whats the best way to fix this?

 

[BruhBrahBrad]

Maybe you have a bigger tire on the back, or maybe upgraded gears, throwing off the speedo?

 

[GEKicker08]

I do have bigger wheels and tires on the back but I didn't think it would make the speedo be off that much.. Can I just re-adjust it through one of those tuners or do I have to get different speedo gears?

 

[BruhBrahBrad]

I think if you can do the gear, much cheaper and I think only 96-up can use a tuner for the tire sizes to fix the speedo. Not sure on that so dont qoute me.

 

[ttocs]

the rear tire and wheel size has everything to do with it...... I think I had a buddy prove a while back that his speedo was off, and had it corrected and had the ticket thrown out.

I don't think there are any tuners that will help this.

 

[EastBayStang98]

dallas mustang speed cal

 

[GEKicker08]

Do I just call the courthouse and tell them my speedo is off due to larger rear tires and wheels and they will take it off? I may just get a read of how much over the actual speed the speedo is and remember it instead of fixing it.

 

[MustangChris]

the gear ratio would have to be smaller for it to make the speedo read slower.

I have 4.10s and it reads 70 when im actually doing 60.

 

[MustangChris]

Vehicle speed sensor or the instrument cluster connector (C1) could be bad.

The VSS is located inside the transmission and it is a small magent-sensor (much like an ABS sensor)

what tranny do you have? T5? T45? or an auto?